Response of Bose gases in time-dependent optical superlattices
arXiv:cond-mat/0606677 · doi:10.1088/0953-4075/39/21/015
Abstract
The dynamic response of ultracold Bose gases in one-dimensional optical lattices and superlattices is investigated based on exact numerical time evolutions in the framework of the Bose-Hubbard model. The system is excited by a temporal amplitude modulation of the lattice potential, as it was done in recent experiments. For regular lattice potentials, the dynamic signatures of the superfluid to Mott-insulator transition are studied and the position and the fine-structure of the resonances is explained by a linear response analysis. Using direct simulations and the perturbative analysis it is shown that in the presence of a two-colour superlattice the excitation spectrum changes significantly when going from the homogeneous Mott-insulator the quasi Bose-glass phase. A characteristic and experimentally accessible signature for the quasi Bose-glass is the appearance of low-lying resonances and a suppression of the dominant resonance of the Mott-insulator phase.
arXiv comment20 pages, 9 figures; added references and corrected typos
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Cited by in corpus (7)
- Resonantly Enhanced Tunneling and Transport of Ultracold Atoms on Tilted Optical Lattices
- Many-body Landau-Zener tunneling in the Bose-Hubbard model
- Lattice modulation spectroscopy of strongly interacting bosons in disordered and quasi-periodic optical lattices
- Phase Diagram of Bosons in Two-Color Superlattices from Experimental Parameters
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- Bose-Fermi mixtures in 1D optical superlattices
- Ultracold Bose gases in time-dependent 1D superlattices: response and quasimomentum structure